Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 278)

Publication AG-UM008C-EN-P - February 2005
8-12 Configuring Modems
Figure 8.6 Typical SCADA Configuration Using MARC Leased-Line Modems
Figure 8.7 Typical SCADA Configuration Using MARC Dial-Up Modems
MARC Model 166-101
Model 166-101 is an asynchronous frequency-shift keyed (FSK)
modem for use on leased lines or local twisted pairs. This modem,
which fits into a single slot of the Allen-Bradley 1746 chassis, features
switch-selected Bell and CCITT operating modes and adjustable
transmit levels.
To connect an Allen-Bradley SLC processor to this module, follow
these specifications for:
•
cable pin assignments
•
switch settings
TIP
For additional modem specifications consult your
MARC user documentation or www.miille.com.
SCADA host
Allen-Bradley
DF1-protocol
RS-232
Leased Telephone Lines
RS-232
DH+
PLC-5/20 with
MARC
137-001
SLC 5/03 with
MARC
166-101 PLC-5/40 with
MARC
148-001
1785-KE
41192
Enhanced
PLC-5
Processor
SLC 5/03
Processor
Mo
dem
Mod
em
RS-232
RS-232